EP 0569740 B1 19971001 - Method for automatic calibration of electricity meters and apparatus therefor
Title (en)
Method for automatic calibration of electricity meters and apparatus therefor
Title (de)
Verfahren zur selbsttätigen Kalibration von Elektrizitätszählern und Anordnung zur Durchführung des Verfahrens
Title (fr)
Procédé d'étalonnage automatique de compteurs d'électricité et dispositif pour sa mise en oeuvre
Publication
Application
Priority
CH 151392 A 19920512
Abstract (en)
[origin: EP0569740A1] The electricity meters (1) which in each case have one single-phase measuring unit (7) per phase of each type of energy measured are interconnected with a reference electricity meter (2), generating a reference frequency (fR,j), power-feeding sources (3, 4) and phase shifter (5) in such a manner that the single-phase measuring units (7) and the reference electricity meter (7) each measure an identical power value of an identical type of energy which is located within one of a number of power ranges into which the power measuring range of the electricity meters (1) is subdivided. In each single-phase measuring unit (7), its pulse frequency, which is proportional to the measured power, is multiplied by a calibration and correction factor for each power range for the purpose of generating a frequency fS,j. Starting from a starting instant, pulses, the frequency of which is equal to the reference frequency (fR,j) multiplied by KMD,j = [RZ/RR,j].[KA/nS] are counted during a time window ns/f s,j. RR,j is the number of pulses per energy unit of the reference frequency (fR,j). RZ is a counter constant, KA is a time matching factor and ns is a stored number. The count obtained is stored as value of a calibration factor and called up in operation, for example when the power associated with the measured energy is within the relevant power range. Its subsequent multiplication by a correction factor results in the value of the calibration and correction factor. The method and the arrangement permit the automatic calibration of complex electricity meters in a particularly simple manner. <IMAGE>
IPC 1-7
IPC 8 full level
G01R 35/04 (2006.01)
CPC (source: EP)
G01R 35/04 (2013.01)
Designated contracting state (EPC)
AT CH DE FR GB IT LI
DOCDB simple family (publication)
EP 0569740 A1 19931118; EP 0569740 B1 19971001; AT E158869 T1 19971015; DE 59307443 D1 19971106
DOCDB simple family (application)
EP 93106436 A 19930421; AT 93106436 T 19930421; DE 59307443 T 19930421